Remove duplication for the handling of attributes between different frontends

[Antoni Boucher]

Hi.
We're trying to remove the duplication of the attributes code between 
the C and libgccjit frontend.
The attached patch shows a draft of this attempt that only supports a 
few attributes.
Would that kind of approach be acceptable (I'm not sure since this 
includes a c-family file in libgccjit)?
If not, do you have any idea of how we could do this?
Thanks.
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